Wrinkles: a biological indication of skin ageing
- Expression lines located on the forehead and between the eyebrows, at the nasolabial folds and the corners of the mouth.
- Weakening folds linked to sagging of the skin, loss of skin tone and firmness. These are responsible for altering face shape, creating bags under the eyes, jowls and a double chin.
The mechanisms that produce wrinkles
- The action of the muscles: the skin is constantly worked by the movements of the underlying muscles. These micro-contractions promote the formation of lines between which the skin becomes taut, stretches and finally creases.
- Modification of the dermal constituents: intrinsic and photoinduced ageing lead to a flattening of the junction between the dermis and the epidermis.
- Modification of the skin’s relief: with age, the lines that tauten the skin distend and slowly hollow out. This phenomenon speeds up after the age of 60.